Pythagoras said: “Mathematical principles are the principles of all things”, in other words, the basic structure of “Being” is mathematical. Everything, in some way, can be explained in mathematical terms. It is the mathematical principles that make things as they are, that make them distinct.”
“When you can quantify what you are talking about, and express it numerically, then you know something about it; but when you can’t quantify it, when you can’t express it numerically, your knowledge about it is vague and unsatisfactory … ”. Lord Kelvin (1824-1907)
In other words: “Only what is measurable can be improved”